Conductivity Sensor Void Correction via Capacitance
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Solution Overview
Problem
Conductivity measurements in fluids are often skewed by voids such as air bubbles, which have different electrical characteristics than the fluid, leading to inaccurate determination of fluid conductivity and concentration, particularly in applications like cleaning and sanitizing solutions where bubbles or foam form.
Innovation Solution
A system comprising conductivity and capacitance sensors that measure the fluid's conductivity and capacitance, with a controller correcting the conductivity measurement based on the capacitance data, temperature, and fluid type, to account for the presence of voids and ensure accurate conductivity readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional conductivity sensors are used to measure fluid conductivity, then the measurement process is simple, but the measurement accuracy deteriorates due to voids such as air bubbles affecting the conductivity reading
Solution Approach 1:
The patent introduces capacitance sensors as an intermediary measurement tool to detect void content in the fluid. The capacitance sensor does not directly measure conductivity but provides void content information that is used to correct the conductivity measurement, thereby improving accuracy without making the conductivity sensor itself more complex
Solution Approach 2:
The system uses capacitance measurements to provide feedback about void content, which then feeds back to correct the conductivity measurement. This feedback loop allows the system to automatically compensate for void interference, improving measurement precision while maintaining relatively simple device architecture
2Reliability
If conductivity measurements are performed in fluids containing chemical species that form bubbles or foam, then the concentration determination can be made, but the measurement reliability deteriorates due to void interference
Solution Approach 1:
The patent converts the harmful effect of voids into a useful measurement signal. By using capacitance sensors to detect the void content caused by bubbles or foam, the system transforms the interference into quantifiable data that can be used to correct the conductivity measurement, thereby improving reliability
Solution Approach 2:
The capacitance sensor acts as an intermediary that specifically detects void content without being affected by the chemical species in the fluid. This intermediary measurement allows the system to separate void interference from actual conductivity signals, improving measurement reliability in challenging fluid conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides accurate conductivity measurements by accounting for the effects of voids, allowing for precise determination of fluid conductivity and concentration, even in the presence of air bubbles or foam, thereby improving measurement reliability in fluid flow systems.
Implementation Method 1
first and second capacitance electrodes and a controller configured to determine a measured conductivity from the conductivity sensor and a measured capacitance between the first and second capacitance electrodes
Implementation Method 2
conductivity sensor for measuring the conductivity of a portion of the fluid
Data Source
AI summary
Systems and methods can be used for correcting for the presence of voids in a fluid when measuring the conductivity thereof. The conductivity of a fluid can be measured using a conductivity sensor. Capacitance electrodes can be used to measure the capacitance of the fluid. The measured capacitance affected by the fluid can be used in combination with the measured conductivity to determine a corrected conductivity value that compensates for possible voids in the fluid. Other parameters, such as the makeup or temperature of the fluid can be used in determining the corrected conductivity measurement. Some such systems include an annular housing and can be inserted or integrated into fluid flow systems so that fluid to be analyzed flows through an aperture defined by the annular housing.